Liquid spray nozzles

ABSTRACT

A liquid spray nozzle is formed from a tubular body which is closed off at one end by an end wall. This wall is formed with internal and external grooves intersecting at the center. A disc is secured to the inside of the end wall to convert the internal groove into a passage opening at both ends into the interior of the body. The tubular body is used inside an air casing with nozzles which direct airstreams together in front of the end wall. The nozzle assembly is useful for applications where only very low liquid and air pressures are available.

United States Patent NH 1 i 1 Kenneth Greenwood Cllvlger, Burnley, England 840,013

July 8, i969 Nov. 23, 197! Joseph Lucas (lnduatriea) Limited Birmingham, England July 9, 1968 Great Britain Inventor Appi. No. Filed Patented Ansignee Priority LIQUID SPRAY NOZZLES 3 Claims, 5 Drawing Figs.

U.S. CI 239/426, 239/434, 239/545, 239/597 Int. Cl B05b 1/04 Field of Search 239/426, 434, 60L 422, 543, 545, 597, 599

[ 56] References Cited UNITED STATES PATENTS l,8l3.733 7/l93l Freeman 239/597 2.647.80l i l/i953 Lycan 239/597 2,760,821 8/l956 Kenncy l 239/335 3,447,757 6/1969 Place et ul. 239/60l Primary Examiner- Lloyd L. King Assistant Examiner-Reinhold W. Thieme AtmrneyHolman & Stern ABSTRACT: A liquid spray nonle is formed from a tubular body which is closed off at one end by an end wall. This wall is formed with internal and external grooves intersecting at the center. A disc is secured to the inside of the end wall to convert the internal groove into a passage opening at both ends into the interior of the body.

The tubular body is used inside an air casing with nozzles which direct airstreams together in front of the end walL The nozzle assembly is useful for applications where only very low liquid and air pressures are available.

PATENTEDHUV 23 I971 3,622,079

INVENTOF? Ken 1 Mm 00d 5% ATT FNEYS LIQUID SPRAY NOZZLES This invention relates to liquid spray nozzles for use, inter alia, in burners for gas turbine engines.

A liquid spray nozzle in accordance with the invention comprises a tubular body with an end wall at one end thereof, said wall being formed with internal and external diametral grooves extending transversely to one another and of total depth greater than the thickness of said wall whereby there is communication between said grooves, and a disc of diameter less than the internal diameter of the tube secured to the inner side of said end wall so that both ends of said internal groove communicate with the interior of the tube.

An example of the invention is shown in the accompanying drawings in which:

FIG. 1 is a section through an example of a spray nozzle in accordance with the invention,

FIG. 2 is a section on line 2--2 in FIG. 1,

FIG. 3 is a section of the nozzle in position in a support,

F IG. 4 is a section on line 4-4 in FIG. 3, and

FIG. 5 is an end view of the assembly shown in FIG. 3.

Referring to the drawings the nozzle, which is shown in detail in FIGS. 1 and 2 consists of a length of metal tube having an end wall 11 at one end. A first diametral groove 12 is formed on the internal surface of this wall by a technique such as spark erosion. A second diametral groove 13 perpendicular to the first groove 12 is formed in the external surface of the wall. The total depth of the two grooves is in excess of the thickness of the wall so that the grooves intercommunicate. Secured to the internal surface of the wall is a disc 14 of diameter less than the internal diameter of the tube. The disc 14 is secured in position by welding or otherwise.

Thus when liquid under pressure is applied to the tube two streams of liquid enter the internal groove 12 at opposite ends thereof and discharge through the slot 13 forming a fanshaped spray.

The nozzle shown in FIGS. 1 and 2 is employed in the assembly shown in FIGS. 3, 4 and 5. The tube 10 is mounted in a support 15 with the interior of which the interior of the tube l0 communicates. The support 15 also bears an outer sleeve 16 which surrounds the tube 10 and forms an air gallery hav ing an air inlet 19. This sleeve 16 has its internal surface shaped to the cross section apparent from FIG. 4 by spark erosion or otherwise. As shown this surface converges in a direction away from the support 15 and at the end remote from the support 15 intersects a transverse groove 17 in the external end surface of the sleeve 16. There are thereby formed a pair of air nozzles 18 which direct streams of air towards one another from opposite sides of the nozzle tube 10. The slot 17 extends in the same direction as the groove 13 so that the flat fan-shaped airflow pattern similar to the liquid spray flow pattern is generated. In use, the airflow assists in atomizing the liquid issuing from the nozzle and also serves to carry this away from the nozzle.

Having thus described my invention what I claim as new and desire to secure by Letters is:

l. A liquid spray noale comprising a tubular body with an end wall at one end thereof, said wall being formed with internal and external diametral grooves extending transversely to one another and of total depth greater than the thickness of said wall whereby there is communication between said grooves, and a disc of diameter less than the internal diameter of the tube secured to the inner side of said wall and covering said internal groove so that only both ends of said internal groove communicate with the interior of the tube.

2. A liquid spray nozzle as claimed in claim 1 further comprising an outer sleeve surrounding the tubular body and forming an air casing, said outer sleeve being formed with an air inlet and with air nozzles'which, in use, direct streams of air towards one another from opposite sides of the tubular body across said end wall thereof.

3. A liquid spray nozzle as claimed in claim 2 in which said air noules are formed by the intersection of an external slot in the outer sleeve, extendin parallel to the external slot in the end wall of the tubular y. and an internal profiled surface in the outer sleeve which converges in a direction towards the end of the outer sleeve.

II! 1. l I. i 

1. A liquid spray nozzle comprising a tubular body with an end wall at one end thereof, said wall being formed with internal and external diametral grooves extending transversely to one another and of total depth greater than the thickness of said wall whereby there is communication between said grooves, and a disc of diameter less than the internal diameter of the tube secured to the inner side of said wall and covering said internal groove so that only both ends of said internal groove communicate with the interior of the tube.
 2. A liquid spray nozzle as claimed in claim 1 further comprising an outer sleeve surrounding the tubular body and forming an air casing, said outer sleeve being formed with an air inlet and with air nozzles which, in use, direct streams of air towards one another from opposite sides of the tubular body across said end wall thereof.
 3. A liquid spray nozzle as claimed in claim 2 in which said air nozzles are formed by the intersection of an external slot in the outer sleeve, extending parallel to the external slot in the end wall of the tubular body, and an internal profiled surface in the outer sleeve which converges in a direction towards the end of the outer sleeve. 